#16834: Change ring fails for affine morphisms.
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Reporter: gjorgenson | Owner: gjorgenson
Type: defect | Status: needs_work
Priority: minor | Milestone: sage-6.4
Component: algebraic | Resolution:
geometry | Merged in:
Keywords: | Reviewers: Ben Hutz
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | 0a29b1b9788b97fa7bbd20d9443afe7118be673a
u/gjorgenson/ticket/16834 | Stopgaps:
Dependencies: |
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Changes (by bhutz):
* status: needs_review => needs_work
Comment:
I think the endomorphism check needs some work, since we really want `is`
instead of `==`. Here is a suggestion to simplify things:
{{{
T=self.domain().change_ring(R)
if self.is_endomorphism():
H=End(T)
else:
H=Hom(T,self.codomain().change_ring(R))
}}}
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Ticket URL: <http://trac.sagemath.org/ticket/16834#comment:8>
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